blue book value
noun [ C or U ] US (also Blue Book value) uk/ˌbluː ˈbʊk ˌvæl.juː/ us/ˈbluː ˌbʊk ˌvæl.juː/
（美国）二手车价蓝皮书
the official value of a used (= not new) car, usually according to a published list called the Kelley Blue Book
He paid thousands more than Blue Book value for an old car from the dealership. 他从车行买了一辆二手车，比蓝皮书的估价多出了几千块钱。